In recent years, the rate of mean sea level rise is rapidly increasing from the phenomena of global warming, together with the increasing trend of storm scale. The issue of sea level rise is multifaceted and produces a range of environmental problems. Especially, high tides and the tidal currents become higher, and wave base increases, so the energy received at the coastal boundary may increase. This brings that many coastal environments go into disequilibrium, such as damages to the structures, erosion, and deposition. Similarly it was known that the problems of nearshore processes and damage of berth and counter facilities during storm period had appeared at the small fishery port of Daebang, Samcheonpo Old and New ports, Korea. The purposed this study is try to analyze the impact due to rearrangement of counter facilities and berth layouts adopted for tranquility of those ports. Because these are being connected to Daebang channel, the rearrangement of the structures might affect to the current speed and direction and wave height, so does to the sea bottom undulation. Therefore, it is necessary to take model test for prediction of bottom change under the condition of new layouts of port facilities, and the combined wave and current impacts to the bottom were analyzed by numerical models. The formulated models were compared with the field observations and the possible bottom changes were discussed. Although the model study gave reasonable description of beach processes and approach channel sedimentation mechanism, it is necessary to compare with the long term based field history, including the records of waves, tides and bottom materials, etc. for better prediction.